That was a good variation on the "Snake needs to fill the board" type of puzzles.
I really like how you managed to teach every mechanic without needing any text, that was cleverly designed.
What's holding you back is the lack of music and features outside of the main gameplay loop.
But, the core gameplay is engaging and I can see this having a lot of potential, especially with the different level objectives. Those last levels were quite fun !
Good job !